<?php // $Id: unenrol.php,v 1.32.2.3 2008/05/16 02:07:58 dongsheng Exp $

//  Remove oneself or someone else from a course, unassigning all
//  roles one might have
//
//  This will not delete any of their data from the course,
//  but will remove them from the participant list and prevent
//  any course email being sent to them.

	require_once("../config.php");
	require_once("lib.php");

	$id	  = required_param('id', PARAM_INT);			   //course
	$userid  = optional_param('user', 0, PARAM_INT);		  //course
	$confirm = optional_param('confirm', 0, PARAM_BOOL);

	if($userid == $USER->id){
		// the rest of this code assumes $userid=0 means 
		// you are unassigning yourself, so set this for the
		// correct capabiliy checks & language later
		$userid = 0;
	}

	if (! $course = get_record('course', 'id', $id) ) {
		error('Invalid course id');
	}

	if (! $context = get_context_instance(CONTEXT_COURSE, $course->id)) {
		error('Invalid context');
	}

	require_login($course->id);

	if ($course->metacourse) {
		print_error('cantunenrollfrommetacourse', '', $CFG->wwwroot.'/course/view.php?id='.$course->id);
	}

	if ($userid) {   // Unenrolling someone else
		require_capability('moodle/role:assign', $context, NULL, false);

		$roles = get_user_roles($context, $userid, false);

		// verify user may unassign all roles at course context
		foreach($roles as $role) {
			if (!user_can_assign($context, $role->roleid)) {
				error('Can not unassign this user from role id:'.$role->roleid);
			}
		}

	} else {		 // Unenrol yourself
		require_capability('moodle/role:unassignself', $context, NULL, false);
	}

	if (!empty($USER->access['rsw'][$context->path])) {
		print_error('cantunenrollinthisrole', '',
					$CFG->wwwroot.'/course/view.php?id='.$course->id);
	}

	if ($confirm and confirm_sesskey()) {
		if ($userid) {
			if (! role_unassign(0, $userid, 0, $context->id)) {
				error("An error occurred while trying to unenrol that person.");
			}

			add_to_log($course->id, 'course', 'unenrol',
					"view.php?id=$course->id", $course->id);
			redirect($CFG->wwwroot.'/user/index.php?id='.$course->id);

		} else {
			if (! role_unassign(0, $USER->id, 0, $context->id)) {
				error("An error occurred while trying to unenrol you.");
			}

			// force a refresh of mycourses
			unset($USER->mycourses);
			add_to_log($course->id, 'course', 'unenrol',
					"view.php?id=$course->id", $course->id);

			redirect($CFG->wwwroot);
		}
	}


	$strunenrol = get_string('unenrol');
	$navlinks = array();
	$navlinks[] = array('name' => $strunenrol, 'link' => null, 'type' => 'misc');
	$navigation = build_navigation($navlinks);

	print_header("$course->shortname: $strunenrol", $course->fullname, $navigation);

	if ($userid) {
		if (!$user = get_record('user', 'id', $userid)) {
			error('That user does not exist!');
		}
		$strunenrolsure  = get_string('unenrolsure', '', fullname($user, true));
		notice_yesno($strunenrolsure, "unenrol.php?id=$id&amp;user=$user->id&amp;confirm=yes&amp;sesskey=".sesskey(),
									  $_SERVER['HTTP_REFERER']);
	} else {
		$strunenrolsure  = get_string('unenrolsure', '', get_string("yourself"));
		notice_yesno($strunenrolsure, "unenrol.php?id=$id&amp;confirm=yes&amp;sesskey=".sesskey(),
									  $_SERVER['HTTP_REFERER']);
	}

	print_footer($course);

?>
